Marantz 2230 Right Channel Crackling?

[mcaddie7]

So I followed some of the other threads and here is where I am at.

- With Volume down or at any volume, there is a slightly crackling on the right channel, this is with heaphones or with a speaker hooked up.
- If I remove the pre out, main in jumpers I still get the crackling.
- If I use an RCA cable to swap the pre out and main in channels, the crackling switches to the left channel.
- The crackling happens in any mode / knob config.

Because of this it is pointing me towards the pre amp board, which I think is is board P550. I also have a can of freeze spray if this would help as well once I know which board is which / if I'm on the right track. I would like to put the system under load to get things warm to see if the problem gets worse, can I hook 2 8Ohm resistors to the output channels to simulate a speaker consistently on?

Any troubleshooting guides for narrowing down the board would be greatly appreciated. Because the sound stops when the jumper is removed, that makes me think it is in the Pre-AMP / tone board.

Thanks!

 

[painttoad]

Because the sound stops when the jumper is removed, that makes me think it is in the Pre-AMP / tone board.

- If I remove the pre out, main in jumpers I still get the crackling.

- If I use an RCA cable to swap the pre out and main in channels, the crackling switches to the left channel.

this is confusing

 

[patfont]

Sounds like a transistor on P400 Preamp board right channel.
You can try to use freeze spray on the transistors for the right channel.

H402
H404
H406
H408

See if the spray changes the crackling sound when you hit with freeze spray.
Try to isolate to see which one.

 

[mcaddie7]

this is confusing

Hi What part of this is confusing? When the pre out, main in jacks that are on the back of the unit are connected, I get the crackling on the right channel. If I remove them, the sounds goes away completely. If I use RCA cables instead of the small jumpers, the crackling switches to the left side. I added a picture if it helps describe it better.

 

[mcaddie7]

Sounds like a transistor on P400 Preamp board right channel.
You can try to use freeze spray on the transistors for the right channel.

H402
H404
H406
H408

See if the spray changes the crackling sound when you hit with freeze spray.
Try to isolate to see which one.

So, the crackling is pretty quiet at times. Is there a way to warm up these transistors as well to make the problem worse? I'll give this a try tonight and see if I can make it go away by freezing those 4 in the first place. Thanks for a place to look! So check board P400, as this is the pre amp?

 

[painttoad]

Hi What part of this is confusing? When the pre out, main in jacks that are on the back of the unit are connected, I get the crackling on the right channel. If I remove them, the sounds goes away completely. If I use RCA cables instead of the small jumpers, the crackling switches to the left side. I added a picture if it helps describe it better.

If I remove the pre out, main in jumpers I still get the crackling.

i dunno